MPMediaLibrary not working properly - iOS 14 beta

I'm using the MPMediaLibrary's addItem(withProductID:completionHandler:) function:

https://developer.apple.com/documentation/mediaplayer/mpmedialibrary/1621278-additem

but the completion is never called, no matter where I call it in my code, regardless if the item was or wasn't already in the user's library. Has the API changed or is this a beta issue?
Answered by Slin in 631521022
I am having the same issue, it worked fine with an older beta, but always hangs with beta 7 (I didn't update for a while, so I don't know when it started).
MPMediaLibrary not working properly - iOS 14 beta
 
 
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